Hot-blast stove.



F. L. WHiTE.

HOT BLAST STOVE.

APPLICATION FILED 1 J LY 21.1917.

1,249,701l. Patented Dec, 11,1917.

2 SHEETS-SHEET I.

WITNESSES 1F. L. WHITE.

HOT BLAST STOVE- I APPLICATION FILED JULY 2?, IQIT- 4 LQ%QJYUL Patented Dec. 11, 1917.

2 SHEETS-SHEET 2.

INVENTOR till FRANK L. WHITE, OF PITTSBURGH, PENNSYLVANIA.

HOT-BLAST STOVE.

Specification of Letters Patent.

Patented Dee. it, i217,

Application filed July 27, 1917. Serial No. 183,105.

To all whom it may concern Be it known that T, FRANK L. WHITE, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Hot- Blast Stoves, of which the following is a specification.

My invention relates to the construction and arrangement on the stoves of the cleaning openings or ports, stack outlets and closures therefor, and similar connectives of hot blast stoves, and more particularly relates to the construction and arrangement of the means employed in closing the stove cleaning openings and in connecting the stoves with the stove chimney fines.

One object of my invention is to provide a. hot blast stove having a novel construction and arrangement of openings and closures therefor, whereby a more uniform interchange of heat in the stove checkerwork is obtained and wherein the number of such connectives is lessened.

Another object oi my invention is to provide a hot blast stove having novel means for closing the cleaning openings of the stoves.

A further object of the invention is to provide a hot blast stove having novel means for operating the closures for the stove openings whereby the amount of manuah labor required to open and close such openlngs 1n the operation of the stoves is materially reduced.

A still further object of my invention is the provision of a hot blast stove having the novel. constructions, arrangements, and combinations of parts shown in the drawings, to be described in detail hereinafter, and to be specifically covered by the appended claims.

Referring nov: to the drawings, forming part of this specification, Figure 1 is an elevation showing a stove cleaning opening or port in open position, with the connectives cooperating therewith, shown as disposed, when in inoperative position, at each suite of the cleaning opening.

Fig. 2 is an elevation, sirnllar to that shown in Fig. 1, showing a branch pipe in position to operatively connect a stove cleaning opening with an 1nlet openmg of an underground flue leading to the stove chimney.

Fig. 3 is an elevation, similar to that of 1B igs. 1 and 2, showing the stove clean ng opening with the door forming the closure for such opening in closed position as when the stove is on air.

Fig. 4: is a sectional elevation of the apparatus as shown in Fig. 3, the section being taken on the line TVIV of Fig. 3.

In the accompanying drawings, the numeral 2 designates the metal shell of a regenerative hot blast stove having a refractory hning 3, the stove being provided with the usual combustion chamber and checkerwork. The construction of the interior of the stove, and the stove cold-blast inlet and hot-blast outlet, not forming part of my invention, are not illustrated nor further described. The stove is provided with the usual complement of stove cleaning openings 4, blow-off openings, and air inlet openings.

The stove, adjacent to its lower end, is provided with at least one, and preferably with a series of the cleaning openings 4, in such case the cleaning openings being, as nearly as may be, equally spaced on the periphery of the stove. In vertical alinement with the opening t or each of these openings, is an inlet formed of a flanged metal niemher 5 which is positioned to project slightly above the ground level 6, and which leads to the underground stack due 7. The metal member '5 on its upper end, hasa tilting door 8 pivotally secured thereon which is arranged to close the inlet end of the flue 7 when the stove is on air 2'. 0. when compressed air is being conducted through the stove to transform the cold-blast into hot-blast in its passage through the stove frointhe cold blast main to the hot blast main.

The cleaning openings 4. are provided with a flanged fitting 9 which is riveted or otherwise secured to the-stove shell 2, and this fitting has a head 10 removably secured on its outer end, with an opening in the head arranged to be closed by the door 11. The outer end of the head 10 has a series of radially extending arms 12, a horizontal rail 13 being secured on the upper pair of the arms 12 to provide a track for the flanged wheels 14:, 14, of the door 11, similar flanged wheels 15, 15, being provided on the elbow or flue connection 16. The doors 11 form closures for the cleaning openings 4, for use when the stove is on air, these doors each having a clamping bar 17 pivoted thereto and provided with forked ends by which the bar is detachably fastened' to a head 10. The-doors 11 also have an upwardly extending flange 18 on which supporting track wheels 14, 14, are rotatably mounted. A shaft 19 having a hand wheel 20 on one end and a spur pinion 21 on its other end, also is rotatably mounted on the upwardly extending flange 18, this spur pinion having teeth meshing with the rack teeth 22 formed on the horizontal rail or track 13. (See Figs. 1 and 4).

The door 11 also has a lug 23 on which a flat spring 24 is fastened and this spring 18 adapted to engage with the face of the horizontal track rail 25 which is fastened to the lower pair of arms 12 on the head 10 so as to move the door away from the face of the head 10 when the clamping bar is released after the stove has been"on air. In this way tearing of the packing in the face of the door 11 is avoided and prevented.

The elbow or branch pipe 16 which is em ployed to connect the cleaning opening 4 of the stove with the inlet 5 to the underground flue 7 leading to the stove stack or chimney, is movably secured on the upper track rail by means of the flanged track wheels l5, 15. A link or latch bar 26, which is pivotally secured at one end to the flange 18 on the door 11, has a slot 26 in its opposite end by which the bar is connected to a pin 26 on the flanged upper end of the elbow or branch pipe 16 to temporarily attach the elbow 16 to the door 11 and enable the elbow to be positively moved into and out of position in front of the stove cleaning opening 4 through the medium of the hand wheel 20. The elbow 16 is positioned (as shown in Fig. 2) to connect the cleaning opening 4 of the stove with the inlet 5 to the flue 7 when combustible gases are being burned in the stove combustion chamber and the products of combustion passin through the stove to heat its checkerwor are being discharged from the stove through the cleaning opening 4 into the elbow or branch pipe 16 and into the chimney flue 7 (i. e. when the stove is on as.).

An anti-friction roller 27 on the elbow or branch pipe 16, which engages with the lower track or rail 23 and with the flanged wheels 15, 15, serves to maintain the elbow in position while being moved on the track 13.

The branch pipe 16, adjacent to its-lower end, is provided with a bent arm 28 which extends lengthwise horizontally, and the forward end 28 of this arm is arranged to engage with the end 29 of the lifting lever 29 which is connected to the pivot shaft 30 of the tilting door 8 to lift this door as the branch pipe 16 approaches a position in front of the cleaning opening 4 of the stove. The lifting lever 29 may be arranged to act tilting door on the flue inlet as the branch pipe 16 is being moved away from MS operative position in front of the cleaning openmg. I

The lower end of the elbow forming the branch pipe 16 is provided with a rin or sleeve 3l-which is arranged to turn axially on the elbow. The ring is loosely mounted on the sleeve, being secured thereon by means of pins 32 on the lower end of the elbow which project outwardly into the slotted openings 33 in the ring, and the an gular sides of these openings form cam surfaces which raise and lower the ring verti- The head 10 on the stove fitting 9 has a projecting lug 35 forming a stop which is engaged by the lug 36 on the elbow l6 and lug 37 on the door or head 11 to locate the elbow and the door opposite the opening 4 leading into the stove.

The operation of my improved apparatus will now be described. When the stack is neither on air nor on gas, such as for example, when the stove is being cleaned, the cleaning opening 4 will be opened so as to permit of workmen removing accumulations of flue dust from the store through this opening. In such case the cleaning door 11 will be located at the right, and the branch pipe or elbow 16 at the left of the cleaning opening, and the tilting door 8 will be in closed position. (See Fig. 1.)

After being cleaned it is necessary to again heat the stove, and before the heating operation is commenced it is necessary to shift the elbow forming the branch pipe into operative position or from the position shown in Fig. 1 into that shown in Fig. 2. In doing this the hand wheel 20 is first turned to move the door-ll until it is opposite the cleaning opening 4. The latch bar 26 is then swung intoposition to fasten the'elbow to the door (as is shown in Fig. 3). The hand wheel 20 is then turned clockwise to shift the cleaning door 11 and, through the latch bar 26, move the elbow or branch pipe 16 into the position shown in Fig. 2. As the branch pipe 16 approaches its operative position in front of the bent arm 28 on the elbow engages with the end 29 of the lifting lever 29 on the tilting door 8 and swings this tilting door from its closed position, (that shown in Fig. 3), into "its open position, (that shown in Fig. 2). as a counter-weight to assist in closing the The telescopic collar 31 on the lower end cleaning opening the y till of the branch pipe or elbow 16 is then to tated or shifted and is thereby moved into close engagement with the upper face of the inlet to the stack due 7.

The stove is then heated by burning combustible gases therein, and the products of combustion, after passing through the stove checkerwork, emerge through the cleaning opening a: and pass through the elbow or branch pipe 16 into the stack flue 7, and through the flue 7 into the stove chimney or stack.

litter the stove has been heated it is put on air, and in preparation for this, all of the openings in the stove are tightly closed. "I he collar 31 on the lower end of the elbow to is turned axially to lift it clear ofthe upper face of the stack flue inlet 5. The hand wheel 20 is then turned to shift the elbow 16 and cleaning door 11 from the position in Fig. 2 into that shown in Fig. 3. The clamping bar 17 is then secured by the connecting bolts and hand nuts to the head of the J cleaning oponmg i so as to tightly clamp the head in place and prevcntlleakage of air from the stove at this point. As the elbow 16 is moved out of operative position into that shown in Fig. 3, the tilting door 8 will gradux-illy move, by gravity, from its open position, shown in Fig. 2), into its closed position, (shown in Figs. 1 and 3).

The cold-blast,- is then turned into the heated stove and in passing therethrough becomes highly heated in-the usual known manner. When it becomes necessary to again heat the stove, the hot-blast and coldblast valves of the stove are closed, and after releasing the air within the stove and reducing it to atmospheric pressure, the cleaning door 11 is unbolted and the hand wheel 20 is again turned to move the door 11 and elbow 16 from the position shown in l igz 3 into that shown in Fig. 2.

The above described operations are then repeated from time to time as becomes necossal'v in cleaning the stove and in changing the stove from on air to on gas, and' vie versa.

he advantages of my invention will be apg n-eciated by those skilled in the art. By the use of my im aroved apparatus the cleaning opening of the stove is utilized. to form a stack outlet as well as in cleaning the stove.

The operations necessary in operating the stove are lessened and made more easily performed.

Modifications in the construction and arrangement of the apparatus forming the novel features of the invention may be made without departing from my invention as delined in the appended claims.

l claim l. A hot blast stove having" a cleaning opening leading to the interior of the stove in combination with removable means for effecting communication between said opening and the stove stack, said means being removable from in front'ot said opening to afford access thereto in cleaning the stove interior, and said opening formingtheorifice through which the waste gases of combustion pass fromthe stove to the stack.

2. A hot blast stove having cleaning openings leading to the interior of the stove in combination with a stack having inlet fines and removable means for connecting at least part of said cleaning openings with said stack inlet flues, said removable means being adapted to be removed from in front of said openings to afford access to said openings in cleaning the stove interior, and said connected openings forming the orifices through which the waste gases of combustion pass from the stove to the stack.

3. A hot blast stove having a plurality of cleaning openings leading to the interior of the stove in combination with a stack having inlet fines, and removable means for connecting said cleaning openings with said stack inlet flues, said removable means being adapted to be removed from in front of said openings to afford access thereto in cleaning the stove interior, and said connected openings forming the orifices through which the waste gases of combustion pass from the stove to the'stack.

4. In a hot blast stove, the combination with a cleaning opening in the stove, and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to con nect said opening and inlet, a door forming a closure for said opening, a tilting door forming a closure for said inlet, and means for moving said branchv pipe and closures into and out of operative position in front of said cleaning opening.

5. In a hot blast stove, the combination with a cleaning opening in the stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said opening and inlet, a door forming a closure for said opening, a tiltin door forming a closure for said inlet, and means for moving said-branch pipe into operative posia closure for said opening, a tilting door forming a closure for said mlet, means for moving the closure for said cleaning opening into and out of operative position, and means detachably connecting said closure with the branch pipe to alternately move the cleaning opening closure and branch pipe into and out of operative position.

7. In a hot blast stove, the combination with a cleaning opening in the stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said 0 ening and inlet, a door forming a closure or sand inlet, means for movingthe closure for said cleaning opening into and out of operative position, means detachably connecting said closure with the branch pipe to alternately move the closure and branch pipe into and out of operative position in front of said cleaning opening, and means on the branch pipe for moving said tilting closure into and out of inlet closing position.

8. In a hot blast stove, the combination with a cleaning opening in the stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said opening and inlet, a door forming a closure for said opening, a tilting door forming a closure of said inlet, a track on which said branch pipe and cleaning opening closure are mounted, means for moving said closure into and out of position in front of the cleaning opening, means detachably connecting said cleaning closure and branch pipe to permit movement of said closure with or independently of said branch pipe, and means on said branch pipe for automatically moving said tilting closure into and out of open position when said branch pipe is moved into and out of operative position.

9. In a hot blast stove, the combination with a cleaning opening in the'stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said opening and inlet, a door forming a closure for sald opening, a tilting door forming a closure of said inlet, a track on which said branch pipe and cleaning open-- ing closure are mounted, means for moving said closure into and out of positlon in front of the cleaning opening, and means detachably connecting said cleanlng opening clocopies of this patent may be obtained for sure and branch pipe to permit movement of said closure with, or independently of said branch pipe.

10. In a hot blast stove, the combination with a cleaning opening in the stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said 0 ening and inlet, a door forming a closure or said opening, a tilting door forming a closure of said inlet, a track on which said branch pipe and cleaning opening closure are mounted, means for moving said closure into and out of position in front of the cleaning opening, means detachably connecting said cleaning closure and a branch pipe to permit movement of said closure with or independently of said branch pipe, and means on said branch pipe for automatically moving said tilting closure into and out of open position when said branch pipe is moved into and out of operative position.

i 11. In a hot blast stove, the combination with a cleaning opening in the stove and a stack flue inlet adjacent to said opening, of a branch pipe movable into position to connect said opening and inlet, a door forming a closure for said opening, a tilting door forming a closure of said inlet, a track on which said branch pipe and cleaning opening closure are mounted, means for movingsaid closure into and out of position in front of the cleaning opening, meansdetachably connecting said cleaning opening. closure and branch pipe to permit movement of said a closure with or independently of said branch pipe, means on said branch pipe for automatically moving said tilting closure into and out of open position when said branch pipe is moved into and out of operative position, and means on the end of said branch pipe movable into and out of engagement with said stack flue inlet.

In testimony whereof I have hereunto set In hand.

y FRANK L. WHITE.

five cents each, by addressing the commissioner of Yatentu.

weahmgtomhc." 

